Remove second collision node from camera_link

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Basic Info

Info	Please fill out this column
Ticket(s) this addresses	None
Primary OS tested on	Ubuntu
Robotic platform tested on	gazebo simulation

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Description of contribution in a few bullet points

Remove the second collision node from camera_link in the waffle.model.

Fixes this Error:

[gzserver-1] [Msg] Loading world file [/opt/ros/foxy/share/nav2_bringup/worlds/waffle.model]
[gzserver-1] Error: Non-unique names detected in type collision in
[gzserver-1] <link name='camera_link'>
[gzserver-1]   <inertial>
[gzserver-1]     <pose>0.069 -0.047 0.107 0 -0 0</pose>
[gzserver-1]     <inertia>
[gzserver-1]       <ixx>0.001</ixx>
[gzserver-1]       <ixy>0</ixy>
[gzserver-1]       <ixz>0</ixz>
[gzserver-1]       <iyy>0.001</iyy>
[gzserver-1]       <iyz>0</iyz>
[gzserver-1]       <izz>0.001</izz>
[gzserver-1]     </inertia>
[gzserver-1]     <mass>0.035</mass>
[gzserver-1]   </inertial>
[gzserver-1]   <collision name='collision'>
[gzserver-1]     <pose>0 0.047 -0.005 0 -0 0</pose>
[gzserver-1]     <geometry>
[gzserver-1]       <box>
[gzserver-1]         <size>0.008 0.13 0.022</size>
[gzserver-1]       </box>
[gzserver-1]     </geometry>
[gzserver-1]   </collision>
[gzserver-1]   <pose>0.069 -0.047 0.107 0 -0 0</pose>
[gzserver-1]   <sensor name='intel_realsense_r200_depth' type='depth'>
[gzserver-1]     <always_on>1</always_on>
[gzserver-1]     <update_rate>5</update_rate>
[gzserver-1]     <pose>0.064 -0.047 0.107 0 -0 0</pose>
[gzserver-1]     <camera name='realsense_depth_camera'>
[gzserver-1]       <horizontal_fov>1.047</horizontal_fov>
[gzserver-1]       <image>
[gzserver-1]         <width>320</width>
[gzserver-1]         <height>240</height>
[gzserver-1]       </image>
[gzserver-1]       <clip>
[gzserver-1]         <near>0.1</near>
[gzserver-1]         <far>100</far>
[gzserver-1]       </clip>
[gzserver-1]     </camera>
[gzserver-1]     <plugin name='intel_realsense_r200_depth_driver' filename='libgazebo_ros_camera.so'>
[gzserver-1]       <ros/>
[gzserver-1]       <camera_name>intel_realsense_r200_depth</camera_name>
[gzserver-1]       <frame_name>camera_depth_frame</frame_name>
[gzserver-1]       <hack_baseline>0.07</hack_baseline>
[gzserver-1]       <min_depth>0.001</min_depth>
[gzserver-1]       <max_depth>5.0</max_depth>
[gzserver-1]     </plugin>
[gzserver-1]   </sensor>
[gzserver-1]   <collision name='collision'>
[gzserver-1]     <pose>0 0.047 -0.005 0 -0 0</pose>
[gzserver-1]     <geometry>
[gzserver-1]       <box>
[gzserver-1]         <size>0.008 0.13 0.022</size>
[gzserver-1]       </box>
[gzserver-1]     </geometry>
[gzserver-1]   </collision>
[gzserver-1]   <pose>0.069 -0.047 0.107 0 -0 0</pose>
[gzserver-1] </link>
[gzserver-1] 
[gzserver-1] [Err] [Server.cc:98] SDF is not valid, see errors above. This can lead to an unexpected behaviour.

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Description of documentation updates required from your changes

None

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Future work that may be required in bullet points

None

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